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Founded by Chintaku Hayao in Ozeki Ozakimura, Suizhou (now Ozakimura, Hanamatsu City, Osaka Prefecture)
Honganji Otsukazibetsuin (Osaka Prefecture) 1705
Celebrated the 1705 (Bōei 2) September 18 ceremony. Founder Chintaku Ryūemon served as master builder and was involved in the construction. The appearance from that time is still conveyed today.
September 18, 1705 (Bōei 2) celebration. Founder Chintaku Ryōemon served as master builder. The site still conveys its original appearance.
Founder Chintaku Zenzo aimed to acquire the latest Western architectural knowledge and moved to Tokyo. He received patronage from many clients and handled numerous projects.
Founder Chintaku Tsuyuzan established Chintaku Group in Yokohori-cho, Higashi-ku, Osaka Prefecture (now Kyutaro-cho, Chuo-ku, Osaka City)
In 1887 (Meiji 20), Zenzo moved to a location in Osaka City and renamed his shop "Chintaku Group".
1887 (Meiji 20) Founder Chintaku Zenzo moved to Tokyo in 1884 (Meiji 17) and embraced the wave of Meiji civilization and modernization, learning new Western architectural techniques and modern management. He received patronage from many clients and in 1887 (Meiji 20) moved to Osaka, renaming his shop "Chintaku Group."
Amagasaki Spinning Main Factory (Hyogo Prefecture) 1891
The first full-scale textile company born in Hyōgo Prefecture. This was the first project undertaken solely by our company. The demon-vanishing arrows used at the topping-off ceremony still remain.
Tokyo branch office established (promoted to Tokyo branch in 1919)
Symbol of the bustling commercial capital Osaka. The roots of the current Osaka Exchange. A monument shaped like rice stands on the site.
Establishment of the Joint-Stock Company Enkaku Group
Former Osaka City Hall 1921
A Renaissance-style grand building dubbed "Eastern One" (gross floor area 29,000 m², height 53.6 m). It was beloved by Osaka residents for over 60 years until it was replaced by the current city hall.
The former Dai Nippon Bakujuu brewery factory, predecessor of Asahi Beer. The red-brick beer factory with an 80cm thick wall is a famous scenery of Hakata.
Head office moved to 3-chiome, Tosa-hori-dori, Nishi-ku, Osaka
Nagoya branch office established (promoted to Nagoya branch in 1942)
One of the eight scenic spots of Omi in Shiga. It revitalizes one of Japan's three great bridges, the origin of "Hurry slowly".
First contract-based compressed air diving construction in Japan: Aizumabashi (Tokyo)
Built as one of the reconstruction elementary schools after the Great Kanto Earthquake. In 1999 it was designated a historic building by Tokyo. It conveys a refined presence fitting the streets of Ginza.
Established Chintaku Group Co., Ltd. and absorbed the partnership Chintaku Group
In 1931 (Showa 6), the Chintaku Group reorganized into a corporation and was established with a capital of 500,000 yen.
In 1931 (Showa 6), Chintaku Katsutaro became president. He studied modern civil engineering at Kyoto Imperial University, gained experience at Okura Group, and mastered modern management. His father, Chintaku Zenzo, also supported the company as a consultant.
1931 (Showa 6), birth of Hiraichi Senkō
1931 (Showa 6) Chintaku Group reorganized as a corporation with a capital of 500,000 yen.
1931 (Showa 6) Chintaku Sakutarō became president.
1931 (Showa 6), birth of Hiraichi Senkō
Opening of Dalian Branch Office
1932 (Showa 7), Akihabara Station three-dimensionalization
In 1932 (Showa 7), the first high school (now Komaba Campus of the University of Tokyo) was constructed.
1932 (Showa 7), Akihabara Station three-dimensionalization
1932 (Showa 7) First High School (now Komaba Campus, University of Tokyo).
Branch offices opened in Tianjin, Shinjing, Jingcheng, and Pyongyang
Katsukou Bridge (Tokyo) 1937
1937 (Showa 12), Katsuhō Bridge
1937 (Showa 12), Katsuhō Bridge
In 1938 (Showa 13), Chintaku Hisayoshi became president.
1938 (Showa 13) Chintaku Yasuyoshi became president.
Established Manchurian corporation Chintaku Group in Shinjing City
Branch offices opened in Taipei and Manila
Opening of Fukuoka Branch
Sendai branch office established (promoted to Sendai branch in 1963)
Hiroshima branch office established (promoted to Hiroshima branch in 1967)
In 1945 (Showa 20), after the war, despite unprecedented chaos, the Chintaku Group undertook many projects for national reconstruction.
After the end of the war in 1945 (Showa 20), despite unprecedented chaos, the Chintaku Group undertook many projects toward the reconstruction of the nation.
Head office moved to 1-chiome, Kyo-machi-hori-ue-dori, Nishi-ku, Osaka (now Nishi-ku Kyo-machi-hori 1-chiome)
Sapporo branch office established (promoted to Sapporo branch in 1965)
1948 (Showa 23), construction at the entrance of the military ship island (Tadashima coal mine)
1948 (Showa 23) Gunma Island (Tadashima Coal Mine).
1958 (Showa 33), Tokyo Metropolitan Satocho Sewage Treatment Plant
1958 (Showa 33) Tokyo Metropolitan Suna-cho Sewage Treatment Plant.
In 1959 (Showa 34), U.S. Marine Corps Camp Schwab in Okinawa.
1959 (Showa 34) U.S. Marine Corps Camp Schwab, Okinawa.
Head office moved to 3-chiome, Awa-za-ue-dori, Nishi-ku, Osaka (now Nishi-ku Nishi-honmachi 2-chiome)
Listed on the Second Section of the Osaka Stock Exchange
Implementation of the "Subsurface Tunnel Boring Shield Method"
In 1964 (Showa 39), Komazawa Olympic facilities.
1964 (Showa 39), Risshō Kōsei Association Great Cathedral
1964 (Showa 39) Komazawa Olympic facilities.
1964 (Showa 39) Risshō Kōsei Association Grand Cathedral.
Implementation of the "Bridge Technology Dividark Method"
1968 (Showa 43), Osaka Chamber of Commerce and Industry
1968 (Showa 43) Osaka Chamber of Commerce.
Capital increase to 2.4 billion yen
1970 (Showa 45), Osaka Expo
1970 (Showa 45) Osaka Expo.
In 1971 (Showa 46), expansion of technology development and the start of overseas business diversified construction demand.
1971 (Showa 46) Conversion.
Relocation of the Tokyo branch to Ichibancho, Chiyoda-ku, Tokyo
Capital increase to 3.5 billion yen
Establishment of local subsidiaries in the United States and Brazil
In 1974 (Showa 49), Tanegashima Space Center (Kagoshima Prefecture)
- Known as the "world's most beautiful rocket base," it opened a new era of Japanese space development.
Capital increase to 3.675 billion yen
Renaming of the headquarters to Osaka branch and the Tokyo branch to Tokyo branch
In 1978 (Showa 53), Joetsu Shinkansen Agatsuma River bridge (Gunma Prefecture)
- A T-shaped PC rib bridge with the longest span at the time (109m) and the longest continuous rib railway bridge in Japan.
Opening of Shikoku Branch, Chiba Branch, Yokohama Branch
In 1979 (Showa 54), Tokyo Steel Okayama Plant
- A core plant of Tokyo Steel, responsible for many projects over the years.
Chairman appointed as Kiyoshi Tanaka, President appointed as Kazunobu Tanaka
Development and Practical Implementation of the Enkaku-Style Continuous Underground Wall (ZBW) Method
In 1981 (Showa 56), Nissan Technical Center (Kanagawa Prefecture)
- Nissan's technology development hub, becoming a comprehensive manufacturing base.
Development and Practical Implementation of the Expanded Base Pile (ZTR) Method
In 1985 (Showa 60), Osaka City Hall
- Rebuilt the former city hall from 1921 (Taisho 10) on our site. The new hall inherits the former building's dignity and has won awards such as the 28th BCS Award.
Establishment of a local subsidiary in the Philippines
Development and implementation of the "Tanaka Cleanroom System (ZCR) Method"
Opening of North Kanto Branch
Development and Practical Implementation of the Enkaku-Style Deep Ground Improvement (ZECOM) Method
Centennial Celebration Ceremony
Establishment of Tokyo Headquarters
In 1987 (Showa 62), Tohoku Gakuin University Izumi Campus (Miyagi Prefecture)
- Constructed a comprehensive campus on 100,000 tsubo of land in Izumi-ku, Sendai.
In 1988 (Showa 63), Nissho Kanjo Building (Osaka Prefecture)
- The headquarters of Daijiten Jochiku, famous for "Japan's summer, the summer of Kanjo." Designed and built by us.
In 1988 (Showa 63), Seto Ohashi Bridge (Kagawa Prefecture)
- A dream project connecting Honshu and Shikoku. The first of the four bridges, the Kijima-Sakaide route. We constructed the Iwakurojima and Hishishima viaducts.
Renaming of the Fukuoka branch to Kyushu branch, Sendai branch to Tohoku branch, and Sapporo branch to Hokkaido branch
Development and implementation of the "Cutting Soil Reinforcement Drain Nail Method"
Development and Practical Implementation of the Water-Through Underground Continuous Wall (EDW) Method
In 1990 (Heisei 2), Nexus Hyakudō Michael Graves Building (Fukuoka Prefecture)
- A postmodern flagship, a residential complex designed by American architect Michael Graves. We also built the adjacent Stanley Tiger Man Building, collaborating with foreign designers.
Acquisition of the Japan Building Center rating for the "Tanaka Group Seismic Isolation Method"
1991 (Heisei 3) Tokyo Metropolitan Government Building, Legislative Chamber
- Construction of the new Legislative Chamber building at the relocated Tokyo Metropolitan Government Building in Shinjuku. The building was designed by the renowned Japanese architect Kenzo Tange.
Opening of the Kobe branch and Jakarta office
1993 (Heisei 5) Sumitomo Life New Alcaic Building (Hyogo Prefecture)
- Our company's first major high-rise hotel construction. The beginning of our high-rise building era.
1993 (Heisei 5) Shikishima Seipan Noda Factory (Chiba Prefecture)
- Current Pasco Kine Factory. The fourth factory in the Kanto region. A production base that delivers safe, reliable, and delicious bread to the dining table.
Development and implementation of the "Silica Shield (N-Zor) Method"
Obtained technical review certification from the Civil Engineering Research Center for the "NM Ground Anchor Method"
Development and implementation of the Shield Direct Launch and Reach (SEW) Method
1995 (Heisei 7) Momoyama Gakuin University, Izumi Campus (Osaka Prefecture)
- Construction of a new campus during the complete relocation from Sakai City to Izumi City. We handled civil works and the construction of 18 buildings of various sizes in a single project.
Completion of the Technology Research Institute Management Building (Seismic Isolation Structure)
Development and implementation of the Shield Methane Gas Detection System
1996 (Heisei 8) Canal City Hakata (Fukuoka Prefecture)
- A mixed-use complex of about 240,000 square meters centered on an artificial canal, designed by American architect John Jardy. A city built around a recreated canal.
Opening of the Manila office
ISO9001 Certification for All Domestic Facilities
Development and commercialization of concrete strength testing method using Soft Core (Soft Coreing) by Koike Core
1997 (Heisei 9) Kujira Bridge (Tokyo)
- A graceful arch-shaped PC rib bridge with the largest span in Japan. Its unique, curved shape is a world‑unique, characterful bridge. A refined, object‑like pedestrian bridge.
Development and commercialization of High-Strength Concrete Filled Steel Tube (CFT) construction method
Opening of Africa office
Development and commercialization of Wing (Tsubasa) Shield and Propulsion construction method
Obtained certification for Soft Coreing Japan Construction Center and Building Conservation Center conservation technology
2000 (Heisei 12) Keio University, Mita Campus East Research Building (Tokyo)
- Inherits the Gothic style of the former red‑brick library, a symbol of the Mita campus. It houses the latest equipment within a classic exterior.
Opening of Manila branch
ISO14001 Certification for All Domestic Facilities
Development and commercialization of High-Strength Concrete Explosion Prevention (FPC) construction method
2001 (Heisei 13) The Chintaku Group has been involved in numerous projects for three centuries since its founding. It reflects our unchanging thoughts in a constantly changing society. As a company "recognized and sought by society," we open the door to the fourth century to leave a rich environment for the next century.
2001 (Heisei 13) Shizuoka Stadium ECOPA
- Venue for the 2002 FIFA Soccer World Cup. In 2019 it also hosted the Rugby World Cup.
2001 (Heisei 13) 21st Century.
Opening of Hanoi office
Received 4th National Technology Development Award for Soft Coreing
Renamed International Division to International Branch
Introduced executive officer system
Merged headquarters with Tokyo headquarters and renamed headquarters
Obtained Ministry of Land, Infrastructure, Transport and Tourism certification for Fc120N Ultra-High Strength Concrete
Received 5th National Technology Development Award for Shield Direct Launch (SEW) construction method
2003 (Heisei 15) Nagoya University, Noe Memorial Materials Science Research Hall
- A project commemorating Professor Ryoji Noe's 2001 Nobel Prize in Chemistry.
Obtained COHSMS certification for construction industry occupational safety and health management system
Obtained construction technology certification for Soft Coreing C+ Civil Engineering Research Center
2004 (Heisei 16) National Museum of Modern Art (Osaka Prefecture)
- Japan's first fully underground contemporary art museum. Designed by world‑renowned architect Cesar Pelli. Features a massive ground‑level monument inspired by the vitality of bamboo.
300th Anniversary of Founding
Established structural design methodology for supertall RC buildings using Fc120N ultra-high strength concrete
Direct launch and arrival of the steel arrow plate shaft pit (D-SLIM) construction method development and practical application
Obtained construction technology certification for Shield Underground Joint (FAST) construction method at the National Technology Research Center
2006 (Heisei 18) Tenma Tenjin Shinshōtei (Osaka Prefecture)
- A regular rakugo performance revived after 60 years in Osaka. The land was donated free of charge by Tenma Shrine, and the construction was funded by donations from the public and businesses.
120th anniversary of establishment
Developed and commercialized seismic reinforcement (TRID) method for existing underwater bridge piers
2007 (Heisei 19) Yokoyagawa Butō Dam (Hyogo Prefecture)
- A gravity concrete dam serving as a domestic water reservoir in Butō Town, Toyooka City. Height 25.7 m, crest length 120 m, total storage 470,000 m³, dam volume 25,000 m³.
Obtained building technology performance certification for RC beam and S mixed structure (RCS joint construction method)
2008 (Heisei 20) Tohoku Shinkansen, San'ui Maruyama Viaduct (Aomori Prefecture)
- The largest extra‑dosed bridge on the Tohoku Shinkansen. It has the longest span in Japan for a Shinkansen bridge (150 m). Designed with a low‑impact aesthetic to respect the adjacent San'ui Maruyama ruins.
Obtained Ministry of Land, Infrastructure, Transport and Tourism certification for Fc150N Ultra-High Strength Concrete
Development and practical implementation of shield rapid curve construction technique (bag) method
Completion of seismic isolation retrofit construction using seismic isolation retrofit method
2009 (Heisei 21) Chiba Central Tower
- A super‑high‑rise residential building with 43 above‑ground floors and a height of 151 m. Uses a central core tube base‑isolated structure for advanced safety.
2009 (Heisei 21) Keihan Electric Railway, Nakanoshima Line, Section 2 (Osaka Prefecture)
- Constructed a shield‑type underground line running east‑west across Osaka's iconic Nakanoshima.
VPN implementation of the workshop network (Virtual Private Network)
Development and practical implementation of soil reduction method for column-type continuous wall (SMW) and other methods
2010 (Heisei 22) Warumi Bridge (Okinawa Prefecture)
- A concrete arch bridge (span 210 m) crossing the Warumi Strait between Okinawa Main Island and Yagaji Island. A long arch bridge spanning the strait.
Practical implementation of Fc120N ultra-high-strength concrete in ultra-tall RC buildings
2011 (Heisei 23) Tokyo Institute of Technology Library
- Built as a 130th‑anniversary commemorative project. Features a triangular glass house supported by Y‑shaped steel beams. The upper level is opened as a plaza, while the library functions are housed underground.
2011 (Heisei 23) Great East Japan Earthquake
- In response to the March 11, 2011 earthquake, we carried out various reconstruction support activities. We provided relief supplies and volunteers from the Tohoku branch removed rubble. Through our construction work, we strongly support the disaster recovery effort.
Practical application of RC beam and S mixed structure (RCS joint construction method)
Development of wear-resistant bit to enable long-distance shield construction
Awarded JC-IGS Technical Award by the International Geosynthetics Society Japan Branch for E-Bag technology
Opening of Ho Chi Minh office
2012 (Heisei 24) Shinminato Bridge (Toyama Prefecture)
- One of the largest cable‑stayed bridges on the Sea of Japan side. A 600 m steel‑concrete composite cable‑stayed bridge. The main span has a two‑layer structure: the upper layer is a dedicated automobile road, and the lower layer is a weather‑resistant bicycle and pedestrian path suspended below the span.
Transfer of our shares to the First Section of the Tokyo Stock Exchange with the establishment of the Japan Exchange Group
Practical implementation of direct launch and arrival method using FRP Yabata
Opening of Myanmar branch
Development and practical implementation of VERJON method for mixed-strength beam punching
Development of A-Flash measurement system for visualizing internal tunnel displacement
2014 (Heisei 26) Bridgestone Vietnam Factory
- Constructed a massive factory over 1 km long in Hanoi, northern Vietnam. The Bridgestone Group's largest factory in the world, producing 24,700 radial tires for passenger cars.
2014 (Heisei 26) Central Circular Shinagawa Line (Tokyo)
- Built an underground tunnel with deep, large-diameter, long-distance shield. The Central Circular Line opened fully, easing congestion in the metropolitan area.
2014 (Heisei 26) Kashiwa no Ha Smart City Gate Square (Chiba)
- Japan's first smart city enabling power exchange during normal times. Our design and construction delivered a mixed-use facility with offices, commercial spaces, hotels, residences, and an energy building.
310th anniversary of founding
Development and practical implementation of Silence Tube® for reducing low-frequency noise in mountain tunnel blasting
Obtained building technology performance certification for adjacent opening foundation beam construction method
2015 (Heisei 27) National Diet Library International Children's Library Arch Building (Tokyo)
- Expansion of a children's book specialty library designed by Tadao Ando Architects and Nikken Sekkei.
2015 (Heisei 27) Tanba Ayabe Road Yura River Bridge (Kyoto)
- A PC bridge with integrated upper and lower line at the pier head. One large-diameter deep foundation pier supports a PC box girder bridge with a 21.2 m wide upper and lower line.
Mr. Chikada Kiyoshi appointed as president
Development and practical implementation of TUNNEL EYE safety and energy-saving control system for mountain tunnel construction
Our president, Chikada Kazuo, received the Rising Sun Heavy Light Medal
Silence Tube® for reducing low-frequency noise in tunnel blasting received the 2017 Environmental Design Award from the Japan Society of Noise Control Engineering
Added fully automatic ventilation control and heavy equipment disaster prevention support system to TUNNEL EYE safety and energy-saving control system for mountain tunnels
Co-developed ZEB evaluation tool
Jointly developed the large-diameter opening foundation beam method
2018 (Heisei 30) Uganda Nile River Source Bridge
- The first cable-stayed bridge in East Africa over the Nile River in Uganda. It boasts the largest concrete main girder cable-stayed bridge built by a Japanese company.
Uganda Nile River Source Bridge – the first cable-stayed bridge in East Africa, spanning the Nile River in Uganda. It boasts the largest scale among cable-stayed bridges with a concrete main span constructed by a Japanese company.
Developed a heavy metal adsorption mat for fuchsine and confirmed its effectiveness in a demonstration test
Developed the YZ reinforcement method (Yamashita Construction Industrial Steel Beam Lateral Buckling Reinforcement Method) for the Chintaku Group
Completely renewed workwear and cold-weather clothing
Implemented a real-time control system for pipe cooling on site
2020 (Reiwa 2) Mitsubishi Estate the ARGYLE Aoyama (Tokyo)
Mitsubishi Estate the ARGYLE Aoyama (Tokyo) – Rebuilding the Aoyama Belco Commons, a long‑time symbol of Minami-Aoyama, into a new symbol of the vibrant North Aoyama.
Obtained ZEB Planner certification
Commercialized an IoT-based retaining wall displacement monitoring system
Osaka Nakanoshima Museum 2021
Shin-Anka Bridge (Iwate Prefecture) 2021
Extension work of the Hokuriku Shinkansen. The Kanazawa–Tsujioka section opened in 2023. It adds a new page to our history of building vital transportation infrastructure that connects the nation.
Opened after more than 30 years since the establishment of the preparation room in 1990 (Heisei 2). Features a black rectangular exterior and a light-filled "Passage" interior. A new cultural and artistic hub in Osaka.
The "Sanriku Coastal Road" planned as a reconstruction road opened fully. A leading project for recovery from the Great East Japan Earthquake.
Hokuriku Shinkansen – Construction of the Dōbashi Bridge and other works in Ishikawa Prefecture. The extension opened in 2023 between Kanazawa and Tsuura, adding a new chapter to the history of building vital transportation infrastructure that connects the nation.
Osaka Nakanoshima Museum of Art – Opened after more than 30 years from the establishment of the preparatory room in 1990 (Heisei 2). Features a black rectangular exterior and a light‑filled "Passage" inside. A new cultural and artistic hub for Osaka.
National Route 45 New Anjiyama Bridge (Iwate Prefecture) – The "Sanriku Coastal Road" planned as a reconstruction road was fully opened. A leading project for recovery from the Great East Japan Earthquake.
Moved shares to the Tokyo Stock Exchange Standard Market following the review of market classifications.
Developed a concrete compaction management system using MR.
Constructed the first Japanese premium hotel brand on the former site of our former headquarters. Reused materials from old buildings throughout, preserving history and memory.
NTT Urban Development voco Osaka Central – Constructed a premium hotel brand, Japan’s first, on the former site of our headquarters. Reused materials from the old building throughout, preserving history and memory.
Moved shares to the Tokyo Stock Exchange Standard Market following a review of market classifications
Developed a concrete compaction management system using MR
Obtained certification as a "Health Management Excellence Corporation 2024 (Large-scale Corporate Division)"
Won the Best Award in the Advanced Technology Division at the 2024 (Reiwa 6) National Construction Association Technical Research Presentation
Osaka branch was certified as a "Kyoto SDGs Partner"
Built the latest research hub of the top HVAC company. Introduced cutting‑edge technologies such as BIM and robotics at every construction stage. Achieved a "Zero Energy Building" (ZEB) with virtually zero energy consumption.
TAIKISHA INNOVATION SITE Alkawa (Kanagawa Prefecture) – Built the latest research hub for a top HVAC company. Introduced cutting‑edge technologies such as BIM and robotics at every construction stage. Achieved a "ZEB" (Zero Energy Building) with virtually zero energy consumption through outstanding environmental performance.
Yokohama branch registered and certified as a "Kawasaki SDGs Gold Partner"
Developed and released the optional rebar modeling system "BeCIM/GR" for BIM/CIM
In 2025, the Chintaku Group celebrated its 320th anniversary. This 320-year history is a testament to the trust our customers have placed in our construction work. We will continue to carry the key of "trust" into the future and build new history.
2025 (Reiwa 7) Future.
2025 (Reiwa 7) 320th Anniversary.
In 2025, the Chintaku Group celebrated its 320th anniversary of founding.
Kane Takagumi Co., Ltd. held the "2026 Skills and Technology Forum" on October 27 and 29, with employees from the civil engineering and construction sectors participating online. The forum featured 17 presentations focused on DX utilization and improving on-site decision-making, and the Outstanding Speaker President Award was presented across various fields.
The sales for the second quarter of FY 2027 were 55,262 million yen, a decline from 63,382 million yen in the same period last year, but operating profit rose 20.8% to 1,516 million yen. Ordinary profit was 2,981 million yen, and the net profit attributable to shareholders of the parent company was 3,762 million yen, a substantial increase year-over-year. Total assets were 224,304 million yen, net assets were 122,569 million yen, and the equity ratio was 54.6%, up from 53.0% in the same period last year.
Chintaku Group Co., Ltd. submitted its half-year report for the 96th period (April 1, 2026 – September 30, 2026). The submission date was November 12, 2026, and it was submitted to the Kinki Financial Bureau Director.
The 24 construction companies, including Qian Gao Group, applied the adhesive and installation anchor certification obtained by J-Hillti and, with the technical cooperation of KFC, secured strength specifications from the Ministry of Land, Infrastructure, Transport and Tourism. This technology can be used for the joining of RC columns, beams, foundations, and steel members, enabling flexible installation even in areas where pre-placed anchors were difficult to install.
Our company participated in the baseball tournament hosted by the Osaka Construction Association, held at the Expo Memorial Park Sports Plaza. Although our team unfortunately lost in the first round, the event served as an opportunity to strengthen camaraderie among member companies and foster unity among employees. Our employee, Takashi Shimamoto, served as the competition chairman and also handled the opening remarks and the ceremonial first pitch.
Zenitaka Corporation will exhibit at Construction Technology Forum 2026 in Chugoku on Thursday, October 29, and Friday, October 30. Its booth will introduce TUNNEL EYE, an energy-saving control system for mountain tunnel construction; CO₂ On-site DACS, a technology for separating, capturing, and fixing CO₂ from exhaust gas; Ikimono Plus, a planting plan design support tool; and a concrete compaction management system. Admission is free.
Zenitaka Corporation will exhibit at Construction Technology Exhibition 2026 Kanto, held at Sunshine City in Ikebukuro on October 20 and 21, 2026. Its booth will feature technologies including TUNNEL EYE, on-site CO₂ DACS, Ikimono Plus, and a concrete compaction management system. Admission is free, and the technologies will also be presented in the official online exhibition.
Zenitaka Corporation’s construction of the R4 Kasumigaura Water Diversion Ishioka Tunnel (Section 4) received the Kanto Regional Development Bureau Director-General’s Award for Excellent Construction Work and Outstanding Engineer for fiscal 2025. The shield-tunneling project was recognized for its coordination with stakeholders and quality management. A certificate was presented to the company’s representative at the award ceremony.
Zenkō Group’s sales for the first quarter of the fiscal year ending March 2027 were ¥24,573 million, down year on year. Operating profit declined 23.8%, and ordinary loss was ¥494 million. Net assets were ¥118,108 million, and the equity ratio was 54.0%.
The research group, composed of 13 companies including Qian Gao Group, revised the construction material technical performance certification of CELBIC in May 2026. The revision expanded the scope of application and added management methods, aiming to improve the performance of environmentally friendly concrete.